Arsenal captain Laurent Koscielny says their change to a back three will inspire a successful season run-in.

Arsene Wenger fielded a defensive trio for the second match running on Sunday and it paid off as the Gunners beat Manchester City 2-1 to book an FA Cup final meeting with Chelsea.

"There was a tactical turnaround but we have been working on it for 15 days," Koscielny said.

"The system suits certain players but it's also good for the whole team. I think we have also found more confidence in this system with three defenders.

"We are more solid. Commitment and determination also helped us to win because over the whole game we played as a team and fought hard."

The Frenchman added: "Before this game we were in quite a dark period, we had lost confidence.

"This victory has allowed us to regain confidence and keep calm, even if not everything was perfect."